Add list of current donors

Based on the patrons for August 2017 on Patreon.
[ci skip]

DONORS.md

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+# Donors to the Godot Engine project
+
+Godot Engine is a non-profit project developed by a community of voluntary
+contributors, as well as occasional paid contributors thanks to the financial
+support of generous donors.
+
+The ways to donate to the project, as well as details on how the funds are
+used, are described on [Godot's website](https://godotengine.org/donate).
+
+The following is a list of the current monthly donors, to be have their
+generous deed immortalized in the next stable release of Godot Engine.
+
+## Platinum sponsors
+
+None so far, but your company could be the first! :)
+
+## Gold sponsors
+
+    Gamblify <https://www.gamblify.com>
+
+## Mini sponsors
+
+    Arron Washington
+    Chrisartguy
+    Christian Uldall Pedersen
+    Hein-Pieter van Braam
+    Matthieu Huvé
+    Neal Gompa (Conan Kudo)
+    Olimpiu Metiu
+    Ruslan Mustakov
+
+## Gold donors
+
+    Alexander Otto
+    Jake Bo
+    Javier
+    Nathan Warden
+    Ranoller
+    Rémi Verschelde
+    Stephan Lanfermann
+
+    Andreas Schüle
+    Bernhard Liebl
+    Jordan M Lucas
+
+    BanjoNode2D
+    Chris Serino
+    Conrad Curry
+    Craig Smith
+    David Churchill
+    Dean Harmon
+    Guilherme Felipe de C. G. da Silva
+    Henrique Alves
+    Laurence Bannister
+    Leo
+    Przemysław Gołąb (n-pigeon)
+    Robert Willes
+    Robin Arys
+    summerblind
+    Testus Maximus
+    Thomas Bjarnelöf
+
+    Amanda Haldy
+    Andreas Haas
+    Bryanna M
+    Cody Parker
+    D
+    Ezra Theunissen
+    flesk
+    François Cantin
+    Hendrik Mans
+    Jeppe Zapp
+    Johannes Wuensch
+    Justin Arnold
+    Justo Delgado Baudí
+    Leandro Voltolino
+    Myles
+    Robert Podgorski
+    Scott Beacon
+    x1212
+
+## Silver donors
+
+    Alex Barsukov
+    Avencherus
+    Bastian Böhm
+    Ben Vercammen
+    Bryan Stevenson
+    Collin Shooltz
+    Fabian Becker
+    fengjiongmax
+    Geequlim
+    Gerrit Großkopf
+    Guldoman
+    hatniX
+    HeartBeast
+    Heribert Hirth
+    Hunter Jones
+    imekon
+    Jacob McKenney
+    Jonathon
+    Josh 'Cheeseness' Bush
+    Julian Murgia
+    Juraj Móza
+    Kevin Boyer
+    Klavdij Voncina
+    Lisandro Lorea
+    magodev
+    Martin Novák
+    Matthew Fitzpatrick
+    Matthew Valancy
+    Matthias Hölzl
+    Max R.R. Collada
+    Michael Gringauz
+    Mikael Olsson
+    Moritz Laass
+    nee
+    nvgrod
+    Pablo Seibelt
+    Pan Ip
+    Paul Mason
+    Paweł Kowal
+    Pietro Vertechi
+    rayos
+    Richman Stewart
+    Roger Smith
+    Sam Van Campenhout
+    Sam Vila
+    Sasori Olkof
+    Sootstone
+    Tavo Tell
+    Thomas Herzog
+    Tom Larrow
+    Trent McPheron
+    Troy Bonneau
+    UltyX
+
+## Bronze donors
+
+There are even more donors that support the project with a small monthly donation.
+Every bit counts and we thank every one of them for their amazing support!